WordPerfect 5.1 for MS-DOS (11-06-89) (5.25 inch floppy)
WordPerfect 5.1 for MS-DOS was first released on November 6, 1989. It was followed by numerous minor 5.1 updates, indicated by the file date stamps.
This was the most popular and widely used version of the WordPerfect product.
WordPerfect 5.1 for DOS adds drop-down menus, context sensitive help, tables, an equation editor, and spreadsheet handling.
A stripped-down lightweight version of WordPerfect 5.1 was sold as LetterPerfect.
The program was originally developed under contract at Brigham Young University for use on a Data General minicomputer in 1979. The authors retained the rights to the program, forming Satellite Systems International (SSI) to sell it under the name WordPerfect in 1980. A port to MS-DOS followed in 1982 and several greatly updated versions quickly followed. The application's feature list was considerably more advanced than contemporary MS-DOS applications like WordStar, and it rapidly displaced most other systems, especially after the 4.2 release in 1986. By release 5.1 in 1989, WordPerfect had become a standard in the MS-DOS market.